package com.hcc.security.service.serviceImpl;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.access.SecurityMetadataSource;
import org.springframework.security.access.intercept.InterceptorStatusToken;
import org.springframework.security.web.FilterInvocation;
import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;
import org.springframework.security.web.access.intercept.FilterSecurityInterceptor;

/**
 * 自定义验证过滤器
 *
 * @version 1.0
 * @author: Administrator
 * @date: 2019/4/28
 */

public class MyFilterSecurityInterceptor extends FilterSecurityInterceptor implements Filter {

  @Autowired
  private MyFilterInvocationSecurityMetadataSource securityMetadataSource;
  @Autowired
  public void setMyAccessDecisionManager(MyAccessDecisionManager myAccessDecisionManager) {
    super.setAccessDecisionManager(myAccessDecisionManager);
  }

  @Override
  public void init(FilterConfig config) throws ServletException {
    super.init(config);
  }

  @Override
  public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
      throws IOException, ServletException {
    super.doFilter(request, response, chain);
  }

  /**
   *
   * @param fi 里面有一个被拦截的url,调用MyInvocationSecurityMetadataSource的getAttributes(Object object)这个方法获取fi对应的所有权限,
   * 再调用MyAccessDecisionManager的decide方法来校验用户的权限是否足够
   * @throws IOException
   * @throws ServletException
   */
  @Override
  public void invoke(FilterInvocation fi) throws IOException, ServletException {
    InterceptorStatusToken token = super.beforeInvocation(fi);
    try{
      //执行下一个拦截器
      fi.getChain().doFilter(fi.getRequest(),fi.getResponse());
    }finally {
      super.afterInvocation(token,null);
    }
  }

  @Override
  public void destroy() {
    super.destroy();
  }

  @Override
  public FilterInvocationSecurityMetadataSource getSecurityMetadataSource() {
    return super.getSecurityMetadataSource();
  }

  @Override
  public SecurityMetadataSource obtainSecurityMetadataSource() {
    return this.securityMetadataSource;
  }

  @Override
  public Class<?> getSecureObjectClass() {
    return super.getSecureObjectClass();
  }
}
